The landing gear - ATA 32 Part 6

After this long silence due to the work we carried out to beautify the museum and

events, here is the continuation of the operation of the landing gear.

Here we are back in the cockpit on the dashboard we find the small size of the landing

gear operating lever very often surprises visitors, here are the reasons.

Normal operation of the landing gear is achieved through electrical control by the

landing gear lever and hydraulic power provided by the GREEN circuit. When

retracted, in addition to the mechanical latches, hydraulic pressure holds the gear and

doors. And possibly for the descent only via the YELLOW circuit.

However, when the L/GEAR lever is at NEUTRAL, both electrical control and hydraulic

supply are shut off leaving the doors held by the mechanical locks, thus preventing

inadvertent landing gear extension through control or actuator failure. During the

landing gear retraction the main and nose wheels are automatically braked and

released.

On the central dashboard in the cockpit, just next to the gear lever, you can follow the

different phases of gear extension and retraction on this luminous indicator.

Signaling is entirely ensured from this signaling indicator which comprises the

following LEDs starting from top to bottom:

- 2 amber squares: "RH SHORT" and "LH SHORT", indicate non-locking of one of the retraction systems when the landing gears are down (normal transient lighting during the extension makeover only).

- 1 amber rectangle "UPPER LOCKS" which indicates the mismatch between the position of the lever and that of at least one of the upper landing gear locks, (normal transient lighting during manoeuvres), retracted-extended.

- 3 red squares: unlocking the MLG and NLG hatches

- 1 red square: top non-locking and bottom non-locking of the rear auxiliary landing gear

- 4 green arrows lock down each train - LH left main landing gear

- NOSE front landing gear - T rear auxiliary landing gear - RH right main landing gear

Each light contains 2 bulbs mounted in parallel. Here are the indications that are seen by the crew for the progress of a normal landing gears manoeuvring sequence: DOWN